01 -
Spray a 9x13 baking dish with oil.
02 -
Heat a frying pan over medium-high heat and lightly brown the sausage, even if fully cooked.
03 -
Place browned sausage into the baking dish.
04 -
Add olive oil to the same pan. Sauté onion, garlic, spinach, and bell peppers until spinach is wilted and vegetables are tender, about 6-7 minutes. Season with salt and black pepper.
05 -
Spread the cooked vegetables over the sausage in the baking dish.
06 -
In a large bowl, whisk together eggs, milk, ½ cup grated cheddar, paprika powder, garlic powder, onion powder, dill, rosemary, red pepper flakes, and salt with black pepper.
07 -
Pour the egg mixture evenly over the vegetables and sausage in the dish. Sprinkle the remaining ¼ cup grated cheddar on top.
08 -
Cover the baking dish with plastic wrap and refrigerate for 2 hours to set.
09 -
Preheat the oven to 375°F (190°C).
10 -
Bake the casserole for 45 minutes, until the edges are golden brown. Let cool before serving.
11 -
Store any leftovers in the fridge and reheat in the microwave before eating.